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Triss [41]
3 years ago
9

Which of these objects has kinetic energy?

Chemistry
1 answer:
pishuonlain [190]3 years ago
4 0

Answer:

The answer is this first one A.

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A 0.1025-g sample of copper metal is dissolved in 35 ml of concentrated hno3 to form cu2 ions and then water is added to make a
GalinKa [24]

Molarity is defined as number of moles of solute in 1 L of solution.

Here, 0.1025 g of Cu is reacted with 35 mL of HNO_{3} to produced Cu^{2+} ions.

The balanced reaction will be as follows:

Cu+3HNO_{3}\rightarrow Cu(NO_{3})_{2}+NO_{2}+H_{2}O

From the above reaction, 1 mole of Cu produces 1 mole of Cu^{2+}, convert the mass of Cu into number of moles as follows:

n=\frac{m}{M}

molar mass of Cu is 63.55 g/mol thus,

n=\frac{0.1025 g}{63.55 g/mol}=0.0016 mol

Now, total molarity of solution, after addition of water is 200 mL or 0.2 L can be calculated as follows:

M=\frac{n}{V}=\frac{0.0016 mol}{0.2 L}=0.008 mol/L=0.008 M

Thus, molarity of Cu^{2+} is 0.008 M.



7 0
3 years ago
If the number of equally likely sample outcomes of a single ASAP! stage of an experiment is 4, what is the total number of eleme
Harrizon [31]

Answer:

C. 64

Explanation:

Given:

The number of equally likely sample outcomes of a single stage = 4

Unknown:

Total number of elements if there are three stages= ?

Solution;

Probability is the likelihood of an event to occur.

  In this problem;

      For a single stage, the likely outcome is 4

So therefore;

   For the 3 stages 4 x 4 x 4 = 64

Therefore, the total number of elements in the sample space of an experiment with 3 stages is 64

3 0
4 years ago
What evidence is there that Potential energy is entering the system
Ulleksa [173]

Answer:

in particular 69-189  084 = 9283983

6 0
3 years ago
Which of the following procedures involves a physical change in one of the substances?
defon

Answer:

D. Separating a salt solution by evaporating the water

Explanation:

B. Allowing a nail to rust is a chemical change.

Becuase once the nail rust it turns into flakes and therefore is no longer a nail.

C. building a model rocket propelled by mixing baking soda and vinegar

By mixing baking soda (a powder) into vinegar ( a Acid) it causes a explosion...

the baking soda dissolve into the acid.... This a chemical reaction

A.creating salt by reacting sodium metal and chlorine gas

Sodium is salt but it says.... Sodium metal..... chlorine gas Changes color and it has a strong odor... chlorine gas with sodium metal turns it into salt.... it doesnt stay a metal or a gas it CHANGES.....

so therefore its a Chemical change

When A object or substance changes form or it causes a exsplosion or reaction it is a chemical change.

D. Separating a salt solution by evaporating the water

For a physical change your object may change color or shape but its still the same object.

salt in water ... The salt dont dissolve it just salty water.

So seperating salt by evaporating the water is a physical change.

5 0
3 years ago
Read 2 more answers
HELP ASAP PLS! How many grams are present in 0.0567 mol C2H6 ?
julia-pushkina [17]
Mass of substance in grams 60.1
3 0
3 years ago
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